Didn't I Say to Make My Abilities Average in the Next Life?! Novel Volume 18 was written by FUNA with art by Itsuki Akata.

The Crimson Vow saved the world, and raced up the ranks of the aristocracy as their reward. But they’re not about to rest on their laurels—especially when there are still uncharted lands to explore. Even the Wonder Trio are on the move, registering as hunters in this new land. Clever, dangerous new monsters, a hitherto-unseen Fluffy Paradise, and more inter-party drama await the Crimson Vow as they set out once more!